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Regulatory Capital Requirements (Tables)
12 Months Ended
Dec. 31, 2017
Banking and Thrift [Abstract]  
Actual Capital Amounts and Ratios
The following table shows the Company’s actual capital amounts and ratios as of December 31, 2017 and 2016, compared to the FRB minimum capital adequacy requirements and the FRB requirements for classification as a well-capitalized institution (dollars in thousands).
 
Actual capital
 
FRB minimum capital
adequacy requirements
 
FRB minimum capital
adequacy requirements with capital conservation buffer
 
To be well-capitalized
under prompt corrective
action provisions
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 leverage capital
$
887,924

 
9.65
%
 
$
367,999

 
4.00
%
 
$
367,999

 
4.00
%
 
$
459,999

 
5.00
%
Common equity Tier 1 risk-based capital
887,924

 
11.87

 
336,736

 
4.50
%
 
430,260

 
5.75

 
486,381

 
6.50

Tier 1 risk-based capital
887,924

 
11.87

 
448,981

 
6.00
%
 
542,502

 
7.25

 
598,623

 
8.00

Total risk-based capital
948,119

 
12.67

 
598,642

 
8.00
%
 
692,157

 
9.25

 
748,278

 
10.00

 
Actual capital
 
FRB minimum capital
adequacy requirements
 
FRB minimum capital
adequacy requirements with capital conservation buffer
 
To be well-capitalized
under prompt corrective
action provisions
 
Amount
 
Ratio
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
As of December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 leverage capital
$
835,282

 
9.25
%
 
$
361,183

 
4.00
%
 
$
361,183

 
4.00
%
 
$
451,479

 
5.00
%
Common equity Tier 1 risk-based capital
835,282

 
11.64

 
323,048

 
4.50

 
367,916

 
5.13
%
 
466,625

 
6.50

Tier 1 risk-based capital
835,282

 
11.64

 
430,731

 
6.00

 
475,599

 
6.63
%
 
574,308

 
8.00

Total risk-based capital
897,165

 
12.50

 
574,308

 
8.00

 
619,176

 
8.63
%
 
717,885

 
10.00

FDIC Minimum Capital Adequacy Requirements
The following table shows the Bank’s actual capital amounts and ratios as of December 31, 2017 and 2016, compared to the FDIC minimum capital adequacy requirements and the FDIC requirements for classification as a well-capitalized institution (dollars in thousands).
 
Actual capital
 
FDIC minimum capital
adequacy requirements
 
FDIC minimum capital
adequacy requirements with Capital Conservation buffer
 
To be well-capitalized
under prompt corrective
action provisions
 
Amount
 
Ratio
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 leverage capital
$
834,084

 
9.07
%
 
$
367,986

 
4.00
%
 
$
367,986

 
4.00
%
 
$
459,983

 
5.00
%
Common equity Tier 1 risk-based capital
834,084

 
11.15

 
336,721

 
4.50
%
 
430,254

 
5.75

 
486,374

 
6.50

Tier 1 risk-based capital
834,084

 
11.15

 
448,961

 
6.00
%
 
542,494

 
7.25

 
598,615

 
8.00

Total risk-based capital
894,430

 
11.95

 
598,615

 
8.00
%
 
692,148

 
9.25

 
748,268

 
10.00

 
 
Actual capital
 
FDIC minimum capital
adequacy requirements
 
FRB minimum capital
adequacy requirements with capital conservation buffer
 
To be well-capitalized
under prompt corrective
action provisions
 
Amount
 
Ratio
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
 
Amount    
 
Ratio    
As of December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tier 1 leverage capital
$
760,708

 
8.42
%
 
$
361,172

 
4.00
%
 
$
361,172

 
4.00
%
 
$
451,465

 
5.00
%
Common equity Tier 1 risk-based capital
760,708

 
10.60

 
323,040

 
4.50

 
367,907

 
5.13
%
 
466,613

 
6.50

Tier 1 risk-based capital
760,708

 
10.60

 
430,720

 
6.00

 
475,587

 
6.63
%
 
574,293

 
8.00

Total risk-based capital
822,743

 
11.46

 
574,293

 
8.00

 
619,160

 
8.63
%
 
717,867

 
10.00